Beer actually has quite a lot of vitamines, but not a wide range of them :) Just the B-complex (or Beer Complex). Those are some values for an average Czech lager, the Dietary Reference Intakes per 1 litre:
Vitamin B1: 3%
Vitamin B2: 20%
Vitamin B3: 45%
Vitamin B6: 31%
Folate (Vitamin B9): 52%